From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Modifications to the 'Goshawk II' crankshaft to deal with torsional effects.
| Identifier | WestWitteringFiles\G\September1921\ Scan15 | |
| Date | 9th September 1921 | |
| To HS.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} Copy to G.L. [strikethrough] " " WOR.{Arthur Wormald - General Works Manager} [strikethrough] " " BY.{R.W. Bailey - Chief Engineer} [strikethrough] " " DA.{Bernard Day - Chassis Design} [strikethrough] ORIGINAL. E1/G13/9/21. 2 X4221 RE "GOSHAWK II" CRANKSHAFT. Referring to "Goshawk II" crankshaft bearings, the front end of the crankshaft which is castellated and carries the spring drive unit is being increased in size to a diameter equal to that of the front journal bearing. The object of this is to make the castellations which carry the damping plate and spring drive unit large enough to deal with the periodic torsional effects that we get at 50 miles an hour. Mr. Royce would like to know if you have noticed similar troubles in connection with "Goshawk I" engine, and if not, where the difference occurs between the two chassis. The spring drive unit will, of course, be accordingly increased in diameter, but will go into the existing dimensions of front flywheel pulley, crankcase etc. quite easily. We are at the same time dealing with the points raised by you in connection with assembling the unit correctly and being able to take it down with the engine in the chassis. E.{Mr Elliott - Chief Engineer} [Signature] [Stamp: FC SEP 14 RECEIVED] [Footer: H H 3327 (10 L) (12 H 320' 10-8-21) C 3003] | ||